Rotary stapler

Abstract

A rotary stapler comprises a base, a machine core, a machine core frame and a machine surface, the machine core is installed under the machine core frame, the front end of the machine core frame is rotatably installed under the front end of the machine surface; it also comprises a labor-saving lever structure arranged above the machine surface, the labor-saving lever structure comprises an upper cover and a knob cover; the upper cover is arranged above the machine surface and the rear ends of the two are hinged on the base through a first hinge shaft, the front end of the machine surface is connected with the front end of the upper cover in linkage; the knob cover is arranged above the upper cover and the rear end of the knob cover is hinged on the base through a second hinge shaft; the top of the upper cover is also provided with a third hinge shaft, the knob cover is also hinged on the upper cover through the third hinge shaft; the third hinge shaft, the second hinge shaft and the first hinge shaft are arranged in sequence from front to back. The rotary stapler is relatively easy to punch.

Description

Technical Field

[0001] This utility model relates to the field of stapler technology, specifically to a rotary stapler. Background Technology

[0002] A stapler is a common device used to bind paper or documents. Traditional staplers are usually only used to bind the edges of paper or documents. However, the rotary staplers that have emerged can handle binding needs at various angles by rotating, and the staples can be used to bind horizontally or vertically, and even to bind along the center seam of the document, greatly improving the flexibility of binding.

[0003] Chinese utility model patent CN2231181Y discloses a rotary stapler, the structure of which is as follows: Figure 1 As shown, it includes a base 1a, a movement 2a, a pressure plate 3a, a movement frame 4a, a screw 5a, a spring 6a, and a face 7a. The movement 2a is mounted on the movement frame 4a. The movement frame 4a is rotatably mounted on the face 7a by the screw 5a. The spring 6a is mounted on the screw 5a and provides elasticity to keep the face 7a tightly against the movement frame 4a.

[0004] However, existing rotary staplers still have the following technical problems: the lack of a labor-saving structure makes stapleping very difficult, especially when there is a large amount of paper. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a rotary stapler that makes stapleping easier.

[0006] The technical solution of this utility model is: a rotary stapler, including a base, a mechanism, a mechanism frame, and a stapler surface. The mechanism is installed under the mechanism frame, and the front end of the mechanism frame is rotatably installed under the front end of the stapler surface. It also includes a force-saving lever structure disposed on the stapler surface, the force-saving lever structure including a top cover and a handle cover. The top cover is disposed on the stapler surface, and the rear ends of both are hinged to the base via a first hinge pin. The front end of the stapler surface is linked to the front end of the top cover. The handle cover is disposed on the top cover, and the rear end of the handle cover is hinged to the base via a second hinge pin. A third hinge pin is also provided on the top of the top cover, and the handle cover is also hinged to the top cover via the third hinge pin. The third hinge pin, the second hinge pin, and the first hinge pin are arranged sequentially from front to back.

[0007] The working principle of this rotary stapler is as follows: The front end of the press cover is pressed down, and the rear end of the press cover rotates around the second hinge axis. Since the press cover is hinged to the upper cover through the third hinge axis, the force acting on the press cover can be transmitted to the upper cover, thus applying pressure to the upper cover. The front end of the machine face is also linked to the front end of the upper cover, thereby causing the front end of the machine face to also press down, while the rear end of the machine face and the rear end of the upper cover rotate together around the first hinge axis. The pressing down of the front end of the machine face ultimately causes the movement frame and the movement to press down to perform the nailing action.

[0008] With the above structure, this utility model has the following advantages: This utility model of a rotary stapler incorporates a force-saving lever structure above the stapler surface. This structure prevents the initial pressing force applied by the hand from acting directly on the stapler surface. Instead, the force is amplified by the handle cover and the top cover before being applied to the stapler surface. As a result, the front end of the stapler surface receives a staple-driving force greater than the initial pressing force. Thus, when the same staple-driving force is required on the stapler surface, the initial pressing force required by the hand can be reduced by incorporating the force-saving lever structure, making staple-driving easier and less strenuous.

[0009] Preferably, the force-saving lever structure further includes a movable lock movably mounted between the upper cover and the machine surface. The movable lock has a connecting portion extending beyond the top of the upper cover, and the third hinge pin is mounted on the connecting portion. The handle cover has a first guide hole that slides back and forth with the third hinge pin. When the movable lock moves back and forth relative to the upper cover, the third hinge pin slides back and forth relative to the first guide hole. This arrangement allows the position of the third hinge pin to be adjusted as needed, thereby obtaining different force-saving effects and opening angles. For applications requiring higher binding thickness, moving the third hinge pin backward can achieve greater force-saving force; while for applications requiring lower binding thickness, the required force-saving force is reduced, allowing the third hinge pin to be moved forward to achieve a smaller opening angle and reduce space occupation.

[0010] Preferably, the connecting part includes two lugs spaced apart on the top of the movable lock, and the top of the upper cover has two slots. The two lugs pass through the two slots respectively and can slide back and forth relative to the slots. The third hinge shaft passes through the two lugs, thereby movably mounting the movable lock on the upper cover. This connecting part has a simple structure, which facilitates both the movable lock being movably mounted on the upper cover and the installation of the third hinge shaft; moreover, the lugs and slots can guide the movable lock's back and forth movement.

[0011] Preferably, the movable lock has an operating part extending beyond the side of the upper cover, and the side of the upper cover has a second guide hole that slides back and forth with the operating part; when the operating part is operated to slide back and forth within the second guide hole, the third hinge pin slides back and forth within the first guide hole. This arrangement facilitates the use of the externally protruding operating part to control the back and forth movement of the movable lock, and the operating part and the second guide hole can guide the back and forth movement of the movable lock.

[0012] Preferably, a cavity for mounting the movable lock is formed between the upper cover and the machine surface. A locking structure is provided between the movable lock and the cavity to limit the movable lock to a first position when it moves forward and to a second position when it moves backward. This arrangement allows the movable lock to be limited to two different positions using the locking structure, thereby allowing the third hinge shaft to be limited to two different positions. This enables the machine to achieve two different effort-saving effects and opening angles, and ensures that it can be stably and reliably limited in both position states.

[0013] Preferably, the upper cover has operating parts on both its left and right sides. The two operating parts can open or close relative to each other in the left-right direction. When the two operating parts are pressed together in the left-right direction, they unlock from the locking structure, allowing the movable lock to switch between the first and second positions. When the movable lock is in the first or second position, releasing the two operating parts locks them back into place with the locking structure, thus limiting the movable lock to the first or second position. This design allows the operating parts not only to move the movable lock but also to lock and unlock by pressing them, simplifying the overall structure and making operation more convenient.

[0014] Preferably, one end of the movable lock is provided with two elastic portions, left and right. The locking structure includes two sliders respectively disposed at the free ends of the two elastic portions, and a groove disposed at the top of the machine surface. The two ends of the groove are respectively provided with a first limiting groove and a second limiting groove. The two operating parts are respectively disposed on the sides of the two sliders. When the two operating parts are located at the foremost end of the second guide hole, the two sliders are limited within the first limiting groove; when the two operating parts are located at the rearmost end of the second guide hole, the two sliders are limited within the second limiting groove. When the two operating parts are pressed together in the left-right direction, the two sliders can disengage from the first or second limiting groove, allowing the movable lock to switch between the first and second positions. This locking structure is simple and convenient to cooperate with the operating parts to achieve reliable unlocking and locking.

[0015] Preferably, the connecting part is located at the rear end of the movable lock, the operating part is located at the front end of the movable lock, and the bottom of the slider abuts against the top of the machine surface. This arrangement is reasonable and conforms to user habits; moreover, the force applied to the rear end of the movable lock by the press cover through the third hinge pin can be reliably transmitted to the front end of the movable lock, so as to apply reliable pressure to the front end of the machine surface.

[0016] Preferably, the upper cover has a first groove with its opening facing downwards, and the machine surface has a second groove with its opening facing upwards. The upper cover is fitted onto the machine surface, causing the first groove and the second groove to fit together to form the receiving cavity. The front end of the upper cover and the front end of the machine surface are locked together by a snap-fit ​​structure. This design utilizes the first groove of the upper cover and the second groove of the machine surface to form the receiving cavity, facilitating the installation of the movable lock within the receiving cavity. Furthermore, the snap-fit ​​structure not only reliably locks the upper cover and the machine surface together but also enables the linkage between the machine surface and the upper cover.

[0017] Preferably, the first force F1 applied to the front end of the snap-on cover is transmitted to the second hinge pin via the first power arm L1, where the first power arm L1 is the distance between the front end of the snap-on cover and the center of the second hinge pin. Then, a second force F2 is generated at the third hinge pin via the second resistance arm L2, where the second resistance arm L2 is the center distance between the second and third hinge pins. The second force F2 is then transmitted to the first hinge pin via the third power arm L3, where the third power arm L3 is the center distance between the first and third hinge pins. Finally, a fourth resistance arm L4... A nailing force F3 is generated at the front end of the upper cover, and the fourth resistance arm L4 is the distance between the front end of the upper cover and the center of the first hinge shaft. The above forces and lever arms satisfy the following relationships: F1*L1=F2*L2; F2*L3=F3*L4, where L1=126mm and L4=140mm. When the two operating parts are located at the rear end of the second guide hole, L2=16mm, L3=45mm, and F1=0.4F3; when the two operating parts are located at the front end of the second guide hole, L2=36mm, L3=65mm, and F1=0.6F3. This setting creates two labor-saving effects of 60% and 40%, which can well meet the labor-saving needs of different paper thicknesses, and also make the opening angle of the machine more suitable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an existing rotary stapler. Figure 2 This is a schematic diagram of the rotary stapler of this utility model in its open state (saving 60% of effort); Figure 3 This is a cross-sectional view of the rotary stapler of this utility model in the open state (60% effort saving); Figure 4 This is a schematic diagram of the rotary stapler of this utility model in its open state (hidden machine surface and 60% labor saving); Figure 5 This is a schematic diagram of the rotary stapler of this utility model in its rotated and open state (hidden machine surface and 60% labor saving); Figure 6 This is a schematic diagram of the rotary stapler of this utility model in its rotated and closed state (hidden machine surface and 60% labor saving); Figure 7 This is a side view of the rotary stapler of this utility model in the open state (hiding the machine surface and part of the base, and saving 60% of effort); Figure 8 This is a side view of the rotary stapler of this utility model in its closed state (hiding the machine surface and part of the base, and saving 60% of effort). Figure 9 This is a schematic diagram of the rotary stapler of this utility model in its open state (hidden machine surface and 40% labor saving); Figure 10 This is a schematic diagram of the rotary stapler of this utility model in its rotated and open state (hidden machine surface and 40% labor saving); Figure 11 This is a schematic diagram of the rotary stapler of this utility model in its rotated and closed state (hiding the machine surface and saving 40% of effort); Figure 12 This is a side view of the rotary stapler of this utility model in the open state (hiding the machine surface and part of the base, and saving 40% of effort); Figure 13 This is a side view of the rotary stapler of this utility model in its closed state (hiding the machine surface and part of the base, and saving 40% of effort). Figure 14 This is an exploded view of the rotary stapler of this utility model. Figure 15 for Figure 14 A magnified view of a portion of point A in the middle; Figure 16 This is a force analysis diagram of the rotary stapler of this utility model (concealing the machine surface and part of the machine base, and saving 60% of the effort); Figure 17 This is a force analysis diagram of the rotary stapler of this utility model (concealing the machine surface and part of the machine base, and saving 40% of the effort); In the existing technical drawings: 1a-base, 2a-moving mechanism, 3a-pin clamping plate, 4a-moving mechanism frame, 5a-screw, 6a-spring, 7a-moving surface; In the figures of this utility model: 1-base, 2-mechanism, 3-mechanism frame, 4-machine surface, 5-top cover, 6-presser cover, 7-first hinge pin, 8-second hinge pin, 9-third hinge pin, 10-movable lock, 11-connecting part, 12-first guide hole, 13-lug, 14-slot, 15-operating part, 16-second guide hole, 17-accommodating cavity, 18-locking structure, 19-elastic part, 20-slider, 21-slide groove, 22-first limiting slot, 23-second limiting slot, 24-first groove, 25-second groove, 26-buckle structure, 27-pressure nail piece, 28-pivot, 29-shaft hole, 30-fastener, 31-elastic reset part, 32-plastic cover. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example

[0020] like Figure 2-17 As shown, a rotary stapler includes a base 1, a stapler 2, a stapler frame 3, and a stapler surface 4. The stapler 2 is mounted below the stapler frame 3, and the front end of the stapler frame 3 is rotatably mounted below the front end of the stapler surface 4. It also includes a lever structure disposed on the stapler surface 4, comprising an upper cover 5 and a handle cover 6. The upper cover 5 is disposed on the stapler surface 4, and both are hinged to the base 1 via a first hinge pin 7. The front end of the stapler surface 4 is linked to the front end of the upper cover 5. The handle cover 6 is disposed on the upper cover 5, and its rear end is hinged to the base 1 via a second hinge pin 8. A third hinge pin 9 is also provided on the top of the upper cover 5, and the handle cover 6 is also hinged to the upper cover 5 via the third hinge pin 9. The third hinge pin 9, the second hinge pin 8, and the first hinge pin 7 are arranged sequentially from front to back. In this embodiment, "up," "down," "left," "right," "front," and "back" are... Figure 4 As the standard.

[0021] In this embodiment, the rotary stapler has a force-saving lever structure above the stapler surface 4. This means that the original pressing force applied by the hand does not act directly on the stapler surface 4, but is amplified by the handle cover 6 and the top cover 5 before acting on the stapler surface 4. As a result, the front end of the stapler surface 4 receives a nailing force greater than the original pressing force. Thus, when the stapler surface 4 requires the same nailing force, the original pressing force required by the hand can be reduced after setting the force-saving lever structure, making it more labor-saving and easier to nail.

[0022] The force-saving lever structure also includes a movable lock 10 that is movably installed between the upper cover 5 and the machine surface 4. The movable lock 10 has a connecting part 11 extending beyond the top of the upper cover 5. A third hinge pin 9 is installed on the connecting part 11. The handle cover 6 has a first guide hole 12 that slides back and forth with the third hinge pin 9. When the movable lock 10 moves back and forth relative to the upper cover 5, the third hinge pin 9 slides back and forth relative to the first guide hole 12. This arrangement allows the position of the third hinge pin 9 to be adjusted as needed, thereby obtaining different force-saving effects and opening angles. For applications requiring higher binding thickness, moving the third hinge pin 9 backward can obtain greater force-saving force; while for applications requiring lower binding thickness, the force-saving requirement is reduced, so the third hinge pin 9 can be moved forward to obtain a smaller opening angle, thus reducing the space occupied.

[0023] The connecting part 11 includes two lugs 13 spaced apart on the top of the movable lock 10. The top of the upper cover 5 has two slots 14. The two lugs 13 pass through the two slots 14 respectively and can slide back and forth relative to the slots 14. The third hinge pin 9 is inserted through the two lugs 13, thereby movably mounting the movable lock 10 on the upper cover 5. The connecting part 11 has a simple structure, which facilitates the movable lock 10 to be movably mounted on the upper cover 5 and also facilitates the installation of the third hinge pin 9. Moreover, the lugs 13 and the slots 14 can guide the back and forth movement of the movable lock 10.

[0024] The movable lock 10 has an operating part 15 extending beyond the side of the upper cover 5. The side of the upper cover 5 has a second guide hole 16 that slides back and forth with the operating part 15. When the operating part 15 is operated to slide back and forth within the second guide hole 16, the third hinge pin 9 slides back and forth within the first guide hole 12. This arrangement facilitates the operation of the movable lock 10's back and forth movement using the externally extending operating part 15, and the operating part 15 and the second guide hole 16 can guide the back and forth movement of the movable lock 10.

[0025] A cavity 17 for mounting the movable lock 10 is formed between the upper cover 5 and the machine surface 4. A locking structure 18 is provided between the movable lock 10 and the cavity 17 to limit the movable lock 10 to a first position when it moves forward and to a second position when it moves backward. This arrangement allows the movable lock 10 to be limited to two different positions using the locking structure 18, thereby allowing the third hinge shaft 9 to be limited to two different positions. This enables the machine to achieve two different effort-saving effects and opening angles, and ensures that it can be stably and reliably limited in both position states.

[0026] The top cover 5 has operating parts 15 on both the left and right sides. The two operating parts 15 can open or close to each other in the left and right direction. When the two operating parts 15 are pressed together in the left and right direction, the operating parts 15 are unlocked from the locking structure 18, so that the movable lock 10 can switch between the first position and the second position. When the movable lock 10 is in the first position or the second position, the two operating parts 15 are released, and the operating parts 15 are locked to the locking structure 18, so that the movable lock 10 is limited to the first position or the second position. This configuration allows the operating parts 15 not only to move the movable lock 10, but also to lock and unlock by pressing the operating parts 15, thus simplifying the overall structure and making the operation more convenient.

[0027] The movable lock 10 has two elastic portions 19 on one side. The locking structure 18 includes two sliders 20 respectively disposed at the free ends of the two elastic portions 19, and a slide groove 21 disposed on the top of the machine surface 4. The two ends of the slide groove 21 are respectively provided with a first limiting groove 22 and a second limiting groove 23. Two operating portions 15 are respectively disposed on the sides of the two sliders 20. When the two operating portions 15 are located at the front end of the second guide hole 16, the two sliders 20 are limited in the first limiting groove 22. When the two operating portions 15 are located at the rear end of the second guide hole 16, the two sliders 20 are limited in the second limiting groove 23. When the two operating portions 15 are pressed in the left-right direction to bring them closer together, the two sliders 20 can disengage from the first limiting groove 22 or the second limiting groove 23, so that the movable lock 10 can switch between the first position and the second position. This locking structure 18 is simple and convenient to cooperate with the operating portions 15 to achieve reliable unlocking and locking.

[0028] The connecting part 11 is located at the rear end of the movable lock 10, the operating part 15 is located at the front end of the movable lock 10, and the bottom of the slider 20 abuts against the top of the machine surface 4. This arrangement is reasonable and conforms to user habits; moreover, the force applied to the rear end of the movable lock 10 by the press cover 6 through the third hinge 9 can be reliably transmitted to the front end of the movable lock 10, so as to apply reliable pressure to the front end of the machine surface 4.

[0029] The upper cover 5 has a first groove 24 with its opening facing downwards, and the machine surface 4 has a second groove 25 with its opening facing upwards. The upper cover 5 covers the machine surface 4, so that the first groove 24 and the second groove 25 fit together to form a receiving cavity 17. The front end of the upper cover 5 and the front end of the machine surface 4 are limited together by a snap-fit ​​structure 26. This arrangement utilizes the first groove 24 of the upper cover 5 and the second groove 25 of the machine surface 4 to form the receiving cavity 17, which facilitates the installation of the movable lock 10 in the receiving cavity 17. Moreover, the snap-fit ​​structure 26 not only reliably limits the upper cover 5 and the machine surface 4 together, but also enables the linkage action between the machine surface 4 and the upper cover 5.

[0030] The first force F1 applied to the front end of the snap cover 6 is transmitted to the second hinge pin 8 through the first power arm L1, where the first power arm L1 is the distance between the front end of the snap cover 6 and the center of the second hinge pin 8. Then, through the second resistance arm L2, a second force F2 is generated at the third hinge pin 9, where the second resistance arm L2 is the center distance between the second hinge pin 8 and the third hinge pin 9. The second force F2 is then transmitted to the first hinge pin 7 through the third power arm L3, where the third power arm L3 is the center distance between the first hinge pin 7 and the third hinge pin 9. Finally, through the fourth resistance arm L4, a nailing force F3 is generated at the front end of the upper cover 5, where the fourth resistance arm L4 is the distance between the front end of the upper cover 5 and the center of the first hinge pin 7. The above forces and lever arms satisfy the following relationships: F1*L1=F2*L2; F2*L3=F3*L4, where L1=126mm, L4=140mm. Figure 16 As shown, when the two operating parts 15 are located at the rear end of the second guide hole 16, L2=16mm, L3=45mm, and F1=0.4F3. Thus, the initial force F1 required by the hand is only 40% of the nailing force F3 generated at the front end of the upper cover 5, saving 60% of the nailing force F3. This significantly reduces the effort required and is more suitable for applications requiring thicker paper. Figure 17 As shown, when the two operating parts 15 are located at the front end of the second guide hole 16, L2=36mm, L3=65mm, and F1=0.6F3. In this way, the first force F1 required by the hand is only 60% of the nailing force F3 generated at the front end of the top cover 5, that is, 40% of the nailing force F3 is saved. The force saving is smaller than when the operating parts 15 are located at the rear end of the second guide hole 16, which is more suitable for occasions with lower paper thickness requirements. However, the opening angle of the machine is also relatively smaller at this time, thereby reducing the overall space occupied.

[0031] In this embodiment, as Figure 2 , Figure 3 , Figure 14 As shown, a plastic cover 32 is also fitted over the button cover 6, and a pin retainer 27 is provided at the front end of the movement frame 3. The pin retainer 27 is movably connected to the front end of the movement 2; as shown Figure 3 , Figure 14 and Figure 15 As shown, the front end of the movement frame 3 is also provided with a pivot 28, and the movement surface 4 is provided with a shaft hole 29 for mounting the pivot 28. A fastener 30 is provided in the shaft hole 29 and threadedly connected to the pivot 28. The movement frame 3 is rotatably mounted in the shaft hole 29 of the movement surface 4 via the pivot 28. An elastic reset member 31 is also sleeved on the outside of the pivot 28. One end of the elastic reset member 31 abuts against the fastener 30 and the other end abuts against the shaft hole 29, so that the movement surface 4 is in close contact with the movement frame 3. An angle positioning mechanism is also provided between the front end of the movement frame 3 and the front end of the movement surface 4, so that the movement frame 3 is positioned at different angles after rotating relative to the movement surface 4. The angle positioning mechanism can adopt existing technology and will not be described in detail here.

[0032] The working principle of the rotary stapler in this embodiment is as follows: When binding thicker papers or documents, press the two operating parts 15 together in the left-right direction to unlock them from the locking structure 18. Then move the operating parts 15 to the rear end of the second guide hole 16. At this point, release the two operating parts 15, and the two elastic parts 19 will open to the left and right, allowing the two sliders 20 to engage in the second limiting slot 23. The operating parts 15 will then re-lock with the locking structure 18. As the operating parts 15 slide backward along the second guide hole 16, the third hinge pin 9 also slides backward along the first guide hole 12. Figure 4 and Figure 7 As shown, increasing the machine's opening angle increases the effort required; when the binding angle needs to be changed, the core frame 3 is rotated, and the core frame 3 is limited on the machine surface 4 by the angle positioning mechanism, thus achieving different binding angles, such as... Figure 5 As shown; During nailing, the front end of the press cover 6 is pressed down, and the rear end of the press cover 6 rotates around the second hinge axis 8. Since the press cover 6 is hinged to the upper cover 5 through the third hinge axis 9, the force acting on the press cover 6 can be transmitted to the upper cover 5, thus applying pressure to the upper cover 5. The front end of the movement surface 4 moves in conjunction with the front end of the upper cover 5, thereby causing the front end of the movement surface 4 to also press down, while the rear end of the movement surface 4 rotates together with the rear end of the upper cover 5 around the first hinge axis 7. The downward pressure of the front end of the movement surface 4 ultimately causes the movement frame 3 and the movement 2 to press down to perform the nailing action, as shown below. Figure 6 and Figure 8 As shown; When binding thinner papers or documents, press the two operating parts 15 together in the left-right direction to unlock them from the locking structure 18. Then move the operating parts 15 to the front end of the second guide hole 16. At this point, release the two operating parts 15, and the two elastic parts 19 will open to the left and right, allowing the two sliders 20 to engage in the first limiting slot 22. The operating parts 15 will then re-lock with the locking structure 18. As the operating parts 15 slide forward along the second guide hole 16, the third hinge pin 9 also slides forward along the first guide hole 12. Figure 9 and Figure 12 As shown, a smaller machine opening angle reduces the effort required; when the binding angle needs to be changed, the core frame 3 is rotated, and the core frame 3 is limited on the machine surface 4 by the angle positioning mechanism, thus achieving different binding angles, such as... Figure 10 and Figure 11 As shown.

Claims

1. A rotary stapler, comprising a base (1), a stapler mechanism (2), a stapler frame (3), and a stapler surface (4), wherein the stapler mechanism (2) is mounted under the stapler frame (3), and the front end of the stapler frame (3) is rotatably mounted under the front end of the stapler surface (4); characterized in that: It also includes a force-saving lever structure disposed on the machine surface (4), the force-saving lever structure including an upper cover (5) and a hand-operated cover (6); the upper cover (5) is disposed on the machine surface (4) and the rear ends of both are hinged to the machine base (1) through a first hinge shaft (7), the front end of the machine surface (4) is linked to the front end of the upper cover (5); the hand-operated cover (6) is disposed on the upper cover (5) and the rear end of the hand-operated cover (6) is hinged to the machine base (1) through a second hinge shaft (8); the top of the upper cover (5) is also provided with a third hinge shaft (9), and the hand-operated cover (6) is also hinged to the upper cover (5) through the third hinge shaft (9); the third hinge shaft (9), the second hinge shaft (8) and the first hinge shaft (7) are arranged sequentially from front to back.

2. A rotary stapler according to claim 1, characterized in that: The lever structure also includes a movable lock (10) that is movably installed between the upper cover (5) and the machine surface (4). The movable lock (10) has a connecting part (11) extending beyond the top of the upper cover (5). The third hinge (9) is installed on the connecting part (11). The handle cover (6) has a first guide hole (12) that slides back and forth with the third hinge (9). When the movable lock (10) moves back and forth relative to the upper cover (5), the third hinge (9) slides back and forth relative to the first guide hole (12).

3. A rotary stapler according to claim 2, characterized in that: The connecting part (11) includes two lugs (13) spaced apart on the top of the movable lock (10). The top of the cover (5) is provided with two slots (14). The two lugs (13) pass through the two slots (14) respectively and can slide back and forth relative to the slots (14). The third hinge (9) is provided on the two lugs (13) from left to right, so that the movable lock (10) is movably mounted on the cover (5).

4. A rotary stapler according to claim 2, characterized in that: The movable lock (10) is provided with an operating part (15) extending beyond the side of the upper cover (5). The side of the upper cover (5) is provided with a second guide hole (16) that slides back and forth with the operating part (15). When the operating part (15) is operated to slide back and forth in the second guide hole (16), the third hinge (9) slides back and forth in the first guide hole (12).

5. A rotary stapler according to claim 4, characterized in that: A cavity (17) for mounting the movable lock (10) is formed between the upper cover (5) and the machine surface (4). A locking structure (18) is provided between the movable lock (10) and the cavity (17) for limiting the movable lock (10) to a first position when it moves forward and to a second position when it moves backward.

6. A rotary stapler according to claim 5, characterized in that: The upper cover (5) is provided with the operating parts (15) on both the left and right sides. The two operating parts (15) can open or move closer to each other in the left and right direction. When the two operating parts (15) are pressed in the left and right direction to move closer to each other, the operating parts (15) are unlocked from the locking structure (18), so that the movable lock (10) can switch between the first position and the second position. When the movable lock (10) is in the first position or the second position, the two operating parts (15) are released, and the operating parts (15) are locked from the locking structure (18), so that the movable lock (10) is limited to the first position or the second position.

7. A rotary stapler according to claim 6, characterized in that: The movable lock (10) has two elastic parts (19) on the left and right at one end. The locking structure (18) includes two sliders (20) respectively disposed at the free ends of the two elastic parts (19) and a groove (21) disposed at the top of the machine surface (4). The two ends of the groove (21) are respectively provided with a first limiting groove (22) and a second limiting groove (23). The two operating parts (15) are respectively disposed on the sides of the two sliders (20). The two operating parts (15) are located at the far end of the second guide hole (16). When the front end is in position, the two sliders (20) are limited in the first limiting slot (22). When the two operating parts (15) are located at the rear end of the second guide hole (16), the two sliders (20) are limited in the second limiting slot (23). When the two operating parts (15) are pressed in the left and right direction to bring them closer to each other, the two sliders (20) can disengage from the first limiting slot (22) or the second limiting slot (23), so that the movable lock (10) can switch between the first position and the second position.

8. A rotary stapler according to claim 7, characterized in that: The connecting part (11) is located at the rear end of the movable lock (10), the operating part (15) is located at the front end of the movable lock (10), and the bottom of the slider (20) abuts against the top of the machine surface (4).

9. A rotary stapler according to claim 5, characterized in that: The upper cover (5) has a first groove (24) with the opening facing downwards, and the machine surface (4) has a second groove (25) with the opening facing upwards. The upper cover (5) covers the machine surface (4) so ​​that the first groove (24) and the second groove (25) are joined together to form the receiving cavity (17). The front end of the upper cover (5) and the front end of the machine surface (4) are limited together by a snap-fit ​​structure (26).

10. A rotary stapler according to claim 4, characterized in that: The first force F1 applied to the front end of the push handle cover (6) is transmitted to the second hinge pin (8) through the first power arm L1, where the first power arm L1 is the distance between the front end of the push handle cover (6) and the center of the second hinge pin (8). Then, a second force F2 is generated at the third hinge pin (9) through the second resistance arm L2, where the second resistance arm L2 is the center distance between the second hinge pin (8) and the third hinge pin (9). The second force F2 is then transmitted to the first hinge pin (7) through the third power arm L3, where the third power arm L3 is the center distance between the first hinge pin (7) and the third hinge pin (9). Finally, a fourth resistance arm L4... A nailing force F3 is generated at the front end of the upper cover (5), and the fourth resistance arm L4 is the distance between the front end of the upper cover (5) and the center of the first hinge shaft (7). The above forces and lever arms satisfy the following relationship: F1*L1=F2*L2; F2*L3=F3*L4, where L1=126mm and L4=140mm. When the two operating parts (15) are located at the rear end of the second guide hole (16), L2=16mm, L3=45mm and F1=0.4F3. When the two operating parts (15) are located at the front end of the second guide hole (16), L2=36mm, L3=65mm and F1=0.6F3.

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